17 Crateris

{{Short description|Binary star system in the constellation Hydra}}

{{Starbox observe 2s

| epoch = J2000

| constell = Hydra

| component1 = 17 Crt A

| ra1 = {{RA|11|32|16.40436}}

| dec1 = {{DEC|−29|15|39.6740}}

| appmag_v1 = 5.64

| component2 = 17 Crt B

| ra2 = {{RA|11|32|16.03998}}

| dec2 = {{DEC|−29|15|47.8935}}

| appmag_v2 = 5.76

}}

{{Starbox character

| type =

| class = {{nowrap|F8V + F8V}}

| b-v = {{Val|0.540|0.004}}

| u-b =

| variable =

}}

{{Starbox astrometry

| component1 = 17 Crt A

| radial_v = {{Val|+5.8|0.4}}

| prop_mo_ra = −19.601

| prop_mo_dec = +144.524

| parallax = 36.0601

| p_error = 0.1266

| parallax_footnote =

| absmag_v =

| component2 = 17 Crt B

| radial_v2 =

| prop_mo_ra2 = −22.025

| prop_mo_dec2 = +139.982

| parallax2 = 35.9838

| p_error2 = 0.1320

| parallax_footnote2 =

| absmag_v2 =

}}

{{Starbox detail

| source =

| component1 = 17 Crt A

| mass = 1.20

| radius =

| luminosity = 3.2

| temperature = 6,240

| metal_fe = {{Val|0.04|0.15}}

| gravity = 4.17

| rotational_velocity = 10.0

| age_gyr = 3.95

| component2 = 17 Crt B

| mass2 = 1.18

| luminosity2 = 2.8

| temperature2 = 6,269

| metal_fe2 = {{Val|−0.06|0.15}}

| gravity2 = 4.20

| age_gyr2 = 3.67

| rotational_velocity2 = 9.6

}}

{{Starbox catalog

| names={{odlist | F=17 Crt | HIP=56280 | ADS=8202 | CD=−28°8928 | CCDM=J11323-2916AB | WDS=J11323-2916 }}

| component1=17 Crt A

| names1={{odlist | HR=4444 | HD=100287 | SAO=179968 }}

| component2=17 Crt B

| names2={{odlist | HR=4443 | HD=100286 | SAO=179967 }}

}}

{{Starbox reference

| Simbad=17+Crt

}}

17 Crateris is a wide binary star system in the equatorial constellation of Hydra, located 90.5 light years away from the Sun. It is visible to the naked eye as a faint, yellow-white hued star with a combined apparent visual magnitude of 4.93. The system is traversing the celestial sphere with a relative proper motion of {{Val|24.9|ul=mas}}/y, and is moving away from the Earth with a heliocentric radial velocity of +5.8 km/s.

The dual nature of this system was discovered by W. Herschel in 1783, when they showed an angular separation of {{Val|9.8|ul=arcsecond}}. As of 2015, the two components of this system had a separation of {{Val|9.60|ul=arcsecond}} along a position angle of 210°. This is equivalent to a projected separation of {{Val|241.3|ul=AU}}; wide enough that, thus far, their orbital track appears linear. They are nearly identical F-type main-sequence stars with a stellar classification of F8V. The primary is slightly brighter at magnitude 5.64, while the secondary is magnitude 5.76.

References

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{{citation

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| arxiv=1512.00278}}

}}

Category:F-type main-sequence stars

Crateris, 17

Category:Binary stars

Category:Hydra (constellation)

Hydrae, N

Category:Durchmusterung objects